LaunchPad for Biology: How Life Works (Six-Months Online)
3rd Edition
ISBN: 9781319305727
Author: Morris, JAMES
Publisher: Macmillan Higher Education
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Chapter 31.2, Problem 5SAQ
Summary Introduction
Each plant species alternates among two multicellular forms, which includes a haploid gametophyte generation (makes gametes) and a diploid sporophyte generation (makes spores). One of the major events in the sporophyte generation is the evolution of xylem and phloem. Xylem transports dissolved nutrients and water, whereas phloem transports carbohydrates generated by photosynthesis.
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- A B C D G E F H a) On the diagram, which labeled structure represents the mature male gametophyte? I b) Which labeled structure represents the female megasporangium, prior to the production of spores? c) On the diagram, which labeled structure represents the immature male gametophyte? F d) Which labeled structure represents the mature female gametophyte? Jarrow_forwardDraw a simple diagram illustrating a heterosporous life cycle. Include the sporophyte generation, megaspore, female gametophyte, egg, microspore, male gametophyte, sperm, meiosis, and fertilization. Be sure to indicate whether each generation or kind of cell is haploid or diploid.arrow_forwardWhich of the following comparisons between the moss life cycle and fern life cycle are correct? A) Mosses have flagellated sperm that need water to reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water.B) The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns.C) The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns.D) The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns.E) Both kinds of plants depend on wind for dispersal of spores.arrow_forward
- Byrophytes are usually found in areas that are very wet or damp at least part of the year. Which of the following statements describes characteristics of byrophytes that make them dependent on water? State all that numbers that apply. 1. They have a dominant gametophyte phase. 2. They have swimming sperm that need water so they can swim to fertilize the eggs of other nearby plants. 3. They do not have lignin-stiffened vascular tissue or roots to effectively distribute water throughout the plant.arrow_forwardWhat event begins the gametophyte phase of the life cycle? Where does this event occur in liverworts and mosses?arrow_forwardCompare the function of megaspores and microspores in the seedplant life cycle, and explain where each type of spore forms.arrow_forward
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